Mr. Puffin is a puffin-like bird consistently portrayed as the companion and mascot of Iceland. His appearance features a distinctive pink bow tie and a black belly, differentiating him from regular puffins, though his belly was animated as white in some adaptations. He maintains a cute exterior but talks and acts like an Italian mobster, displaying a haughty attitude, foul-mouthed swagger, and a habit of taking credit for unrelated events.

He frequently appears alongside Iceland across various media, including manga strips, seasonal events, and drama CDs. Beyond simple companionship, he actively comments on situations, often provoking or teasing Iceland. During the 2011 April Fools event, he questioned Iceland’s awareness of the prank after Iceland feigned anger at Denmark’s antics. In the 2010 Christmas event, he was present during Iceland’s forced strip-search, though his specific reactions were not detailed.

Mr. Puffin demonstrates a complex dynamic with Iceland. Though presented as a mascot, he openly ridicules Iceland’s attempts to appear mature and eggs on others during embarrassing moments, such as urging Iceland to confess romantic feelings in spin-off stories. He also shows possessiveness, reacting negatively when Iceland interacts with other characters like Turkey or the Nordics. His speech includes mobster-like phrases, and he is known to roam independently but consistently returns to Iceland’s side.

His narrative involvement includes participating in group activities, such as the 2011 Halloween event where he joined Iceland's pirate-themed outing. He occasionally serves as a comedic foil, exemplified when he loudly cheered during Iceland’s awkward romantic encounter. No concrete background details exist regarding his origins or development across official media. His defining traits—appearance, personality, and role—remain consistent throughout all appearances, with no significant evolution documented.